linux-kernel - Re: [PATCH v6 12/21] arm64:ilp32: share HWCAP between LP64 and ILP32

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Message-ID: <4813942.8ZHz91B9Af@wuerfel>
Date:	Fri, 08 Jan 2016 09:58 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Yury Norov <ynorov@...iumnetworks.com>, catalin.marinas@....com,
	linux-kernel@...r.kernel.org, pinskia@...il.com,
	Prasun.Kapoor@...iumnetworks.com, schwab@...e.de,
	broonie@...nel.org, Nathan_Lynch@...tor.com, agraf@...e.de,
	klimov.linux@...il.com,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	jan.dakinevich@...il.com, Andrew Pinski <apinski@...ium.com>,
	ddaney.cavm@...il.com, bamvor.zhangjian@...wei.com,
	philipp.tomsich@...obroma-systems.com, joseph@...esourcery.com,
	christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH v6 12/21] arm64:ilp32: share HWCAP between LP64 and ILP32

On Friday 08 January 2016 02:34:30 Yury Norov wrote:
>  #define ELF_HWCAP              (elf_hwcap)
>  
>  #ifdef CONFIG_COMPAT
> -#define COMPAT_ELF_HWCAP       (compat_elf_hwcap)
> -#define COMPAT_ELF_HWCAP2      (compat_elf_hwcap2)
>  extern unsigned int compat_elf_hwcap, compat_elf_hwcap2;
> +#define COMPAT_ELF_HWCAP       \
> +       (is_a32_compat_task()   \
> +         ? compat_elf_hwcap    \
> +         : (u32) elf_hwcap)
> +
> +#define COMPAT_ELF_HWCAP2      \
> +       (is_a32_compat_task()   \
> +         ? compat_elf_hwcap2   \
> +         : (u32) (elf_hwcap >> 32))
> +
>  #endif
>  
> 

This should no longer be needed after patch 11: just define the ELF_HWCAP
and ELF_HWCAP2 values for the right mode when including fs/binfmt_elf.c.
You know what it should be at build time, so don't bother doing a runtime
check.

	Arnd